Is there a way to get Chai working with asynchronous Mocha tests?

Question

I\'m running some asynchronous tests in Mocha using the Browser Runner and I\'m trying to use Chai\'s expect style assertions:

window.expect = chai.expect;
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Answer 1

What worked very well for me icm Mocha / Chai was the fakeTimer from Sinon's Library. Just advance the timer in the test where necessary.

var sinon = require('sinon');
clock = sinon.useFakeTimers();
// Do whatever. 
clock.tick( 30000 ); // Advances the JS clock 30 seconds.

Has the added bonus of having the test complete quicker.